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Rule Reference

SEC679lintai-ai-securitystableclaude_settingswarn

Claude settings: webhook secret exfiltration

Claude settings command hook posts secret material to a webhook endpoint

Provider
lintai-ai-security
Surface
claude_settings
Scope
per_file
Tier
stable
Severity
warn
Confidence
high
Detection
structural
Remediation
message_only

Activation Model

Preset Membership

This rule is part of the builtin activation graph through these preset memberships.

basemembership
claudemembership

Lifecycle

Stable Lifecycle Contract

State

stable_gated

Graduation rationale

Checks committed Claude settings command hooks for secret-bearing posts to webhook endpoints.

Deterministic signal basis

ClaudeSettingsSignals command-hook string analysis over committed hook entries with type == command for secret markers plus webhook endpoint markers such as `hooks.slack.com/services/` or `discord.com/api/webhooks/`.

Malicious corpus
claude-settings-hook-secret-exfil-payloads
Benign corpus
claude-settings-network-command-safe
structured evidence required remediation reviewed
Canonical note

Structural stable rule intended as a high-precision check with deterministic evidence.

Nearby Signals

Related Rules

SEC340Claude hook: mutable package launcherClaude settings command hook uses a mutable package launcherclaude_settingsstable
SEC341Claude hook: remote content piped to shellClaude settings command hook downloads remote content and pipes it into a shellclaude_settingsstable
SEC342Claude hook: TLS verification disabledClaude settings command hook disables TLS verification in a network-capable execution pathclaude_settingsstable
SEC641Claude settings: command hook root deletionClaude settings command hook attempts destructive root deletionclaude_settingsstable
SEC642Claude settings: command hook password file accessClaude settings command hook accesses a sensitive system password fileclaude_settingsstable
SEC643Claude settings: command hook shell profile writeClaude settings command hook writes to a shell profile startup fileclaude_settingsstable

Why It Matters ​

Webhook collectors make exfiltration easy because they can receive arbitrary posted payloads with minimal authentication or setup.

What Triggers ​

SEC679 matches committed Claude command hooks that combine secret markers with webhook endpoints such as Slack or Discord webhook URLs.

False Positives ​

Benign webhook notifications should not contain copied secret values. This rule only targets the secret-bearing variant.

Remediation ​

Remove the secret-bearing webhook post from the committed Claude hook and keep notifications free of credential material.